I might be mistaken, but I think tones are a separate algorithm. For example, in AMBE the tones are detected and encoded into a digital word (separate from the speech) and then recreated at the other end. That is, the tones don't pass through.
------------------------------------------------------------------------------
_______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
